Many eyes are on Long Island's shore as Isaias tracks up the coast for a possible Tuesday landfall, and swelling conditions in the surf, strong rip currents and possible beach erosion are expected.

State parks officials say they are hard at work at Jones Beach, using bulldozers to build a wall of sand to stem the effects of the storm. By Tuesday night, state parks Regional Director George Gorman says they hope to have the sand wall up to 8 feet.

"That wall of sand extends throughout the central mall area here at Jones Beach, and it protects the infrastructure," says Gorman. "It prevents water from going under the boardwalk and damaging the boardwalk."

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It's a similar situation at Long Beach, where a bulldozer was seen shifting sand to make a barrier. And at Nickerson Beach, Nassau Executive Laura Curran issued a warning.

"To the swimmers, we have dangerous rip currents so please be very cautious," she says. "We're also having a full moon to coincide with this and we know that can make the tides a little more dramatic."

In Suffolk, County Executive Steve Bellone says, "We are also monitoring any potential storm surge, and the timing of that storm surge may be. Coastal flooding will depend on the track and the timing of the storm, when it is arriving tomorrow."

There's particular concern from officials about Robert Moses and Gilgo Beach state parks, as they are susceptible to erosion, according to Gorman.

The worst threat comes Tuesday after 7 p.m. at high tide, when waves of up to 8 to 10 feet are possible.